Introducing Claude Opus 5
news
anthropic.com
IrregularChat: Full Stack Dev
4w ago
Anthropic announced Claude Opus 5 on July 24, 2026, describing it as a proactive, thoughtful model that approaches the frontier intelligence of Claude Fable 5 at roughly half the price. It is now the
Anthropic has launched Claude Opus 5, positioning it as a major upgrade for developers, enterprises, and agentic workflows. The new model is aimed especially at coding and knowledge work, with Anthrop
Claude Fable is relentlessly proactive
news
simonwillison.net
IrregularChat: AI & Autonomy
Jun 12
Simon Willison describes two days of experience with Claude Fable 5 as “relentlessly proactive,” using a debugging session in Datasette Agent to show how far the model will go to solve a problem. Afte